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WO2003105664A2 - Systeme d'interface d'echantillonnage optique pour une mesure <i>in vivo</i> de tissus - Google Patents

Systeme d'interface d'echantillonnage optique pour une mesure <i>in vivo</i> de tissus Download PDF

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Publication number
WO2003105664A2
WO2003105664A2 PCT/US2003/018665 US0318665W WO03105664A2 WO 2003105664 A2 WO2003105664 A2 WO 2003105664A2 US 0318665 W US0318665 W US 0318665W WO 03105664 A2 WO03105664 A2 WO 03105664A2
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WIPO (PCT)
Prior art keywords
tissue
guide
measurement
measurement site
aperture
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Ceased
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PCT/US2003/018665
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WO2003105664A3 (fr
Inventor
Thomas B. Blank
George Acosta
Mutua Mattu
Marcy Makarewicz
Stephen L. Monfre
Alexander D. Lorenz
Timothy L. Ruchti
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Sensys Medical Inc
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Sensys Medical Inc
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Priority to AU2003243547A priority Critical patent/AU2003243547A1/en
Priority to JP2004512580A priority patent/JP2005530137A/ja
Priority to EP03760324A priority patent/EP1511415A4/fr
Publication of WO2003105664A2 publication Critical patent/WO2003105664A2/fr
Publication of WO2003105664A3 publication Critical patent/WO2003105664A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
    • A61B5/0071—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence by measuring fluorescence emission
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
    • A61B5/0075—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence by spectroscopy, i.e. measuring spectra, e.g. Raman spectroscopy, infrared absorption spectroscopy
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/01—Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/06—Devices, other than using radiation, for detecting or locating foreign bodies ; Determining position of diagnostic devices within or on the body of the patient
    • A61B5/061—Determining position of a probe within the body employing means separate from the probe, e.g. sensing internal probe position employing impedance electrodes on the surface of the body
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration or pH-value ; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid or cerebral tissue
    • A61B5/14532—Measuring characteristics of blood in vivo, e.g. gas concentration or pH-value ; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid or cerebral tissue for measuring glucose, e.g. by tissue impedance measurement
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration or pH-value ; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid or cerebral tissue
    • A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration or pH-value ; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid or cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration or pH-value ; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid or cerebral tissue
    • A61B5/1495—Calibrating or testing of in-vivo probes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/683—Means for maintaining contact with the body
    • A61B5/6832—Means for maintaining contact with the body using adhesives
    • A61B5/6833—Adhesive patches
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6843—Monitoring or controlling sensor contact pressure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
    • A61B2560/02—Operational features
    • A61B2560/0223—Operational features of calibration, e.g. protocols for calibrating sensors
    • A61B2560/0228—Operational features of calibration, e.g. protocols for calibrating sensors using calibration standards
    • A61B2560/0233—Optical standards
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
    • A61B2562/12—Manufacturing methods specially adapted for producing sensors for in-vivo measurements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
    • A61B2562/14—Coupling media or elements to improve sensor contact with skin or tissue
    • A61B2562/146—Coupling media or elements to improve sensor contact with skin or tissue for optical coupling
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6813—Specially adapted to be attached to a specific body part
    • A61B5/6824—Arm or wrist

Definitions

  • the invention relates to optical sampling of tissue in vivo. More particularly, the invention relates to an optical sampling interface system that includes an optical probe placement guide, a means for stabilizing the sampled tissue, an optical coupler for repeatably sampling a tissue measurement site in vivo, and a means for compensating measurement bias.
  • TECHNICAL BACKGROUND In vivo measurement of tissue properties and analytes using optically based analyzers requires that tissue measurement region be positioned and coupled with respect to an optical interface or probe.
  • the requirements of an optical sampling interface system for such placement and coupling would depend upon the nature of the tissue properties and analytes under consideration, the optical technology being applied and the variability of the tissue with respect to the target analyte.
  • the optical measurement is performed in a laboratory where the majority of the factors pertaining to the measurement can be controlled or constrained.
  • there are many demanding in vivo applications that cannot be performed in a laboratory setting but yet require a high degree of optical sample reproducibility.
  • a relatively unskilled operator or user must perform the optical measurement.
  • Diabetes is a leading cause of death and disability worldwide and afflicts an estimated 16 million Americans. Complications of diabetes include heart and kidney disease, blindness, nerve damage, and high blood pressure with the estimated total cost to United States economy alone exceeding $90 billion per year. See Diabetes Statistics, Publication No. 98-3926, National Institutes of Health, Bethesda MD (Nov 1997). Long-term clinical studies show that the onset of complications can be significantly reduced through proper control of blood glucose levels. See The Diabetes Control and Complications Trial Research Group, The effect of intensive treatment of diabetes on the development and progression of long-term complications in insulin-dependent diabetes mellitus, N Eng J of Med, 329:977-86 (1993).
  • a vital element of diabetes management is the self-monitoring of blood glucose levels by diabetics in the home environment.
  • a significant disadvantage of current monitoring techniques is that they discourage regular use due to the inconvenience and pain involved in drawing blood through the skin prior to analysis. Therefore, new methods for self- monitoring of blood glucose levels are required to improve the prospects for more rigorous control of blood glucose in diabetic patients.
  • near-infrared spectroscopy involves the illumination of a spot on the body with near-infrared electromagnetic radiation (light in the wavelength range 700 - 2500 nm). The light is partially absorbed and scattered, according to its interaction with the tissue constituents prior to being reflected back to a detector. The detected light contains quantitative information that is based on the known interaction of the incident light with components of the body tissue including water, fat, protein, and glucose.
  • Previously reported methods for the noninvasive measurement of glucose through near-infrared spectroscopy rely on the detection of the magnitude of light attenuation caused by the absorption signature of blood glucose as represented in the targeted tissue volume.
  • the targeted tissue volume is that portion of irradiated tissue from which light is reflected or transmitted to the spectrometer detection system.
  • the signal due to the absorption of glucose is extracted from the spectral measurement through various methods of signal processing and one or more mathematical models.
  • the models are developed through the process of calibration on the basis of an exemplary set of spectral measurements and associated reference blood glucose values (the calibration set) based on an analysis of capillary (fingertip) or venous blood.
  • NIRI Imaging
  • NIRS quantitation
  • the measurement is further complicated by the heterogeneity of the sample, the multi-layered structure of the skin and the rapid variation related to hydration levels, changes in the volume fraction of blood in the tissue, hormonal stimulation, temperature fluctuations and blood analyte levels. This can be further considered through a discussion of the scattering properties of skin and the dynamic nature of the tissue.
  • Skin consists of a stratified, cellular epidermis, and an underlying dermis of connective tissue. Below the dermis is the subcutaneous fatty layer or adipose tissue.
  • the epidermis is the thin outer layer that provides a barrier to infection and loss of moisture, while the dermis is the thick inner layer that provides mechanical strength and elasticity.
  • the epidermis layer is 10- 150 ⁇ m thick and can be divided into three layers, the basal, middle, and superficial layers. The basal layer borders the dermis and contains pigment-forming melanocyte cells, keratinocyte cells, Langherhan cells and Merkel cells See F.
  • the stratum corneum the outermost layer of the mammalian epidermis, is formed and continuously replenished by the slow upward migration of aqueous keratinocyte cells from the germinative basal layer of the epidermis. It is replenished about every 2 weeks in mature adults.
  • This complex process involving intracellular dehydration and synthesis of an insoluble protein, keratin results in keratin-filled, biologically inactive, shrunken cells.
  • These flat, dehydrated, hexagonal cells are tightly bound to their neighbors and each is approximately 30 ⁇ m wide and 0.8 ⁇ m deep. See H.
  • the major constituent of the dermis apart from water, is a fibrous protein, collagen, which is embedded in a ground substance composed mainly of protein and glycosaminoglycans.
  • the glycosaminoglycans play a key role in regulating the assembly of collagen fibrils and tissue permeability to water and other molecules. See K. Trier, S. Olsen, T. Ammitzboll, Ada. Ophthalmol., v. 69, pp.304-306 (1990).
  • Collagen is the most abundant protein in the human body.
  • Elastin fibers are also plentiful though they constitute a smaller proportion of the bulk.
  • the dermis also contains other cellular constituents and has a very rich blood supply, though no vessels pass the dermo-epidermal junction.
  • Figure 1 shows a plot of the spectral characteristics of excised skin, with no associated fat 101 , pure collagen 102, and beef fat 103.
  • the processed second derivative is used to compare the contributions of fat and collagen with the excised skin, mainly consisting of collagen and water.
  • Scattering results from differences in a medium's refractive index, corresponding to differences in the physical characteristics of the particles that make up the medium.
  • the spatial distribution and intensity of scattered light depends upon the size and shape of the particles relative to the wavelength, and upon the difference in refractive index between the medium and the constituent particles.
  • the scattering coefficient of biological tissue depends on many uncontrollable factors, which include the concentration of interstitial water, the density of structural fibers, and the shapes and sizes of cellular structures. Scattering by collagen fibers is of major importance in determining the penetration of optical radiation within the dermis. See F. Bolin, L. Preuss, R. Taylor, R. Ference, Appl. Opt, v. 28, pp. 2297-2303 (1989).
  • the greater the diffusing power of a medium the greater will be the absorption related to multiple internal reflections. Therefore, reflectance values measured on different sites on the same person, or from the same site on different people, can differ substantially even when the target absorber is present in the same concentration.
  • Total body water accounts for over 60% of the weight of the average person and is distributed between two major compartments: the intracellular fluid
  • the extracellular fluid in turn is divided into the interstitial fluid (extravascular) and the blood plasma (intravascular).
  • Water permeable lipid membranes separate the compartments and water is transferred rapidly between them through the process of diffusion, in order to equalize the concentrations of water and other analytes across the membrane.
  • the net water flux from one compartment to another constitutes the process of osmosis and the amount of pressure required to prevent osmosis is termed the osmotic pressure.
  • the fluid compartments Under static physiological conditions the fluid compartments are at equilibrium. However, during a net fluid gain or loss as a result of water intake or loss, all compartments gain or lose water proportionally and maintain a constant relative volume.
  • the cell membrane is relatively impermeable to most solutes but highly permeable to water, whenever there is a higher concentration of a solute on one side of the cell membrane, water diffuses across the membrane toward the region of higher solute concentration. Large osmotic pressures can develop across the cell membrane with relatively small changes in the concentration of solutes in the extracellular fluid. As a result, relatively small changes in concentration of impermeable solutes in the extracellular fluid, such as glucose, can cause tremendous changes in cell volume.
  • Noninvasive measurement of tissue properties and analytes, such as blood glucose concentration may employ NIR spectroscopic methods.
  • S. Malin, T. Ruchti, U.S. Patent No. 6,280,381 , supra describes a system for noninvasively predicting blood glucose concentrations in vivo, using NIR spectral analysis.
  • Such NIR spectroscopy-based methods utilize calibrations that are developed using repeated in vivo optical samples of the same tissue volume. These successive measurements must yield a substantially repeatable spectrum in order to produce a usable calibration.
  • the heterogeneous and dynamic nature of living human skin leads to sampling uncertainty in the in vivo measurement. Sampling differences can arise due to variable chemical composition and light scattering properties in tissue.
  • a variation in the volume of tissue sampled is likely to lead to a variation in the strength of the glucose signal, even though glucose concentration in the tissue or blood remains constant.
  • Variation in the repeated placement of the optical probe used for sampling at the measuring surface site can lead to sampling errors in two separate ways: first, variations in the location of the probe can cause a different tissue volume to be sampled, and second, varying the amount of pressure applied by the probe on the tissue can alter the optical scattering by the tissue, thereby changing the sampled tissue volume.
  • a change in optical sampling may lead to a variation in the spectral signal for a target analyte even though the concentration of the analyte in the blood or tissue remains unchanged.
  • variable surface reflection leads to a variable light launch into the tissue that in turn gives rise to an increase in nonlinear nature of the spectral measurements.
  • a variable nonlinear measurement would be very difficult to calibrate.
  • the invention provides an optical sampling interface system that minimizes and compensates error resulting from sampling variation and/or state fluctuations at a measurement site during optical tissue sampling and subsequent analyte measurement by spectroscopic means.
  • An optical probe placement guide facilitates repeatable location accuracy on the surface of a tissue measurement site with a minimal and repeatable degree of tissue distortion and displacement.
  • the major structural component of the probe placement guide is a mount having an aperture, into which the optical probe is received during use.
  • the guide aperture induces the formation of a tissue meniscus, created by the pooling of epidermal water in the guide aperture due to the relative difference in the contact pressure at the guide adhesion surface and the guide aperture, where no part of the guide contacts the tissue.
  • the formation of the tissue meniscus minimizes interference due to surface irregularities and controls variation in the volume of tissue sampled.
  • An occlusive element placed over the tissue meniscus isolates the tissue meniscus from environmental fluctuations, thus stabilizing the degree of hydration of the tissue meniscus and thereby stabilizing surface tension of the tissue meniscus.
  • An optical coupling medium placed on the surface tissue at the tissue measurement site eliminates sampling errors due to air gaps between the skin surface and the optical probe.
  • a measurement and bias correction element applies a bias correction to spectral measurements, and the associated analyte measurement. Such bias corrections are performed identically for all data taken over the course of one guide placement. When the guide is removed and replaced, a new bias correction is determined for all subsequent data taken with the second guide placement.
  • each of the separate elements of the invented system can be individually deployed, as standalone solutions to counter various sources of measurement error.
  • the probe placement guide independent of the other elements of the system, provides a significant reduction in sampling error;
  • the occlusive element provides a significant reduction in measurement error due to state fluctuations at the surface of the measurement site; and the correction algorithm can be applied to spectral measurements in settings lacking the other elements of the system.
  • Figure 1 shows second derivative absorbance spectra of excised human skin, pure fat and pure collagen
  • Figure 2 shows an optical probe placement guide according to the invention
  • Figure 3 provides a block diagram of a measurement and bias correction system according to the invention
  • Figure 4 shows an optical probe and a tissue measurement site optically coupled by a layer of an optical coupling fluid according to the invention.
  • Figures 5 - 7 show plots of measurement variation attributable to sampling error without and with the invention.
  • a system is described herein that provides superior sampling precision of the target tissue volume through the use an optical probe placement guide that is removably attached to the tissue site to achieve the goal of highly repeatable probe placement at a targeted tissue measurement site.
  • a key characteristic of the guide is that it provides a means for registering the location of the targeted tissue volume with respect to the optical probe such that a particular tissue volume is precisely sampled by the optical system. Registration refers to providing feedback regarding the position of the optical probe relative to a target location on the tissue.
  • the means for registering between the guide and the optical probe may be mechanical, optical, electrical or magnetic.
  • the guide includes an aperture into which the optical probe is received. The aperture serves several purposes including those of:
  • the guide 200 is oval and contoured to approximate the surface of the sampled tissue site, for example, the volar (that corresponding to the palm of the hand) or dorsal surface of the forearm.
  • the design of the guide is intended to allow for comfortable and unobtrusive use without application of significant mechanical energy to the sampled tissue site.
  • the guide is composed of a rigid polymer, allowing for the creation of a stable tissue meniscus.
  • Attachment of the guide to the tissue site may be by means of an adhesive layer 201 on the contact surface of the guide 200.
  • the adhesive layer may be applied at the time of manufacture, or it may be applied to the guide prior to usage. Generally, the adhesive covers the entire contact surface of the guide, that surface of the guide that is in contact with the skin area adjacent to and surrounding the tissue measurement site. Additionally, other attachment means are suitable such as straps, suction, or armbands.
  • the guide is attached to the tissue site at the beginning of a measurement period. Typically this period is the beginning of a particular day after a previously used guide has been removed.
  • the method of attachment is to place the guide 200 onto a noninvasive measurement device with the adhesive layer in place and exposed.
  • the tissue measurement site is then placed onto the guide with a rough registration through an arm cradle or elbow and wrist supports. During this first placement, the guide becomes affixed to the tissue site.
  • the guide 200 allows for the distribution of mechanical energy transferred from the instrument to the arm over a greater area around the measurement site.
  • the guide may be composed of a flexible material, such as a flexible polymer, that provides for a stabilization of the measurement site and deformation of the underlying tissue without applying undue force to the targeted tissue volume.
  • the guide has an aperture 202, into which an optical probe is received.
  • the sizes and shapes of the optical probe and the guide aperture 202 are matched to each other such that when the optical probe is received by the guide, it fits snugly and provides a mechanical registration in the x-y plane relative to the tissue measurement site.
  • the guide and the optical probe are equipped with mechanical stops 203 that limit and control the penetration of the optical probe into the tissue (the z-direction). The weight of the tissue is transferred to the optical probe through the mechanical stop 203 and thereby reduces the pressure at the tissue measurement site.
  • the guide is equipped with a slot 208 for the optional insertion of a temperature probe. This feature is particularly useful during the calibration phase for monitoring of skin temperature.
  • an occlusion plug 204 is normally inserted into the aperture 202.
  • the occlusion plug penetrates into the aperture to the same extent as the optical probe and thereby creates a stable tissue state by simulating the contact energy of the optical probe.
  • the occlusion plug is composed of a material that provides a hydration barrier, thus promoting the full and stable hydration of the stratum corneum.
  • the plug is composed of the same material as the guide and possess a mechanical stop 205 to control the penetration into the tissue site.
  • the size of the portion of the plug that is inserted into the aperture 206 is matched to the portion of the optical probe that is received by the guide aperture 202.
  • Attachment of the plug to the guide may be through the use of one or more magnets located in both the guide and plug assemblies 207.
  • other methods of attachment may be used, such as VELCRO, adhesives and snaps.
  • the plug can be composed of a material that is elastic in nature and is kept in place by virtue of its tight fit into the guide aperture.
  • the plug can be a hydrophobic material, such as cellophane.
  • an important aspect of the optical sampling system is the maintenance of an optimal level of hydration of the surface tissue at the measurement site for enhancement of the optical signal, sample reproducibility, and suppression of surface reflectance.
  • the preferred embodiment of the hydration mechanism is by occlusive blockage of trans-epidermal water loss (TEWL). . This blockage ensures a steady state hydration as water diffusing from interior tissue is trapped in the stratum corneum. Attainment of high hydration levels reduces the water concentration gradient that provides the driving force for this trans-epidermal water movement.
  • TEWL trans-epidermal water loss
  • the above described occlusive plug fits snugly into the guide aperture during periods between measurements, acting to insulate the tissue in the guide aperture from trans-epidermal water loss and the environmental effects of temperature and humidity that are known to influence the stratum corneum hydration state.
  • wrapping a flexible polymer sheet (an occlusion patch) around the measurement site may also be used to attain a highly hydrated state via occlusion.
  • a vapor barrier or semi-permeable membrane for example, GORE- TEX, manufactured by W. L. Gore and Associates of Newark DE as the mount
  • the "patch” is affixed to the tissue site through an adhesive or other attachment mechanism such as a strap or a wrap;
  • non-occlusive mechanisms for hydration of the stratum corneum may also be used, including: • an application of water that is pneumatically driven into the skin;
  • topical analgesic formulations that enhance and/or stimulate local circulation at the measurement site leading to an improvement in surface hydration.
  • the mechanisms for achieving stratum corneum hydration may also be used in coupled treatments.
  • Skin toner solution or an ultrasound energy application may be used in conjunction with an occlusive plug.
  • subsequent measurements are made by simply placing the tissue site onto the noninvasive measurement device (after removing the occlusion plug) and allowing the guide to provide mechanical registration. After the optical tissue measurement is performed, the tissue is taken away from the device and the occlusion plug is re-inserted.
  • the guide provides a means for optical registration.
  • reflectors or light sensitive elements are placed onto the guide.
  • the optical probe assembly is equipped with light sources and several detectors that allow the position of the guide to be accurately assessed, in either two or three dimensions. In a first configuration, two dimensions (x,y) are assessed and a mechanical stop is used to control the third dimension. In a second configuration, the location of the guide is optically assessed in all three dimensions (x,y,z). Because the position of the guide is constant with respect to the targeted tissue volume, the positional assessment provides accurate information regarding the location of the targeted tissue volume with respect to the optical probe. The registration information provided by such assessment is used to place the tissue site onto the optical probe, or vice versa, through any of the following means:
  • a mechanical positioning system is used to position the tissue measurement site with respect to the optical probe
  • a mechanical positioning system is used to position the optical probe onto the tissue measurement site.
  • a magnetic sensing system can also be readily applied for assessment of the location of the guide with respect to the tissue measurement site.
  • the guide aperture induces the formation of a tissue meniscus, an upward bulge of tissue into the optical probe aperture.
  • the hydrostatic pressure within the tissue in the aperture is greater than that on the nude (guideless) tissue sample. This increased hydrostatic pressure absorbs energy translated to the tissue when the probe contacts the tissue, thus limiting the resulting distortion of dermal collagen tissue. Distortion of dermal collagen has a strong effect on the tissue optical properties and thus the sampled tissue volume. In order to achieve this correction, the termination of the optical probe should be flush with the contact surface at the tissue measurement site when the optical probe is fully seated.
  • the interface between the optical probe and the skin surface at the tissue measurement site can also be a significant source of sampling error. Since the underlying tissue is not homogenous, the surface skin at the tissue measurement site may be uneven, with frequent irregularities. Coupling the relatively smooth surface of the optical probe with the irregular skin surface leads to air gaps between the two surfaces. The air gaps create an interface between the two surfaces that adversely affects the measurement during optical sampling of tissue. As shown in Figure 3, an amount of an optical coupling medium such as an optical coupling fluid 401 between the optical probe 402 and the skin of the tissue measurement site 400 eliminates such gaps.
  • an optical coupling medium such as an optical coupling fluid 401 between the optical probe 402 and the skin of the tissue measurement site 400 eliminates such gaps.
  • the optical coupling fluid • is spectrally inactive
  • the active components of the optical coupling fluid from the class of compounds called perfluorocarbons, those containing only carbon and fluorine atoms. Nominally limiting chain length to less than 20 carbons provides for a molecule having the requisite viscosity characteristics.
  • the molecular species contained in the perfluorocarbon coupling fluid may contain branched or straight chain structures. A mixture of small perfluorocarbon molecules contained in the coupling fluid as polydisperse perfluorocarbons provides the required characteristics while keeping manufacturing costs low.
  • the optical coupling fluid is a perfluoro compound such as those known as FC-40 and FC-70, manufactured by 3M Corporation.
  • FC-40 and FC-70 are inactive in the Near IR region, rendering them particularly well suited for optical sampling procedures employing Near IR spectra. Additionally, they have the advantage of being non-toxic and non-irritating, thus they can come into direct contact with living tissue, even for extended periods of time, without posing a significant health risk to living subjects.
  • perfluoro compounds of this type are hydrophobic and are poor solvents; therefore they are unlikely to absorb water or other contaminants that will adversely affect the result during optical sampling.
  • optical sampling fluid be formulated without the addition of other substances such as alcohols or detergents, which may introduce artifacts into the optical sample.
  • other substances such as alcohols or detergents, which may introduce artifacts into the optical sample.
  • compositions containing perfluorocarbons and chlorofluorocarbons are also suitable as optical coupling fluids: for example a blend of 90% polymeric chlorotrifluroethylene and 10% other fluorocarbons would have the desired optical characteristics. Chlorotrifluorethene could also be used. While these compositions have the desired optical characteristics, their toxicity profiles and their solvent characteristics render them less desirable than the previously described perfluoro compounds.
  • fluid media are suitable for coupling of an optical probe to a tissue measurement site, for example, skin toner solutions or alpha hydroxy- acid solutions.
  • a quantity of optical sampling fluid is placed at the interface of the tissue measurement site and the fiber optic probe so that the tissue measurement site and the fiber optic probe may be tightly optically coupled without leaving any air spaces between the two surfaces.
  • one convenient way of placing the quantity of the optical sampling fluid at the interface between the tissue measurement site and the probe is to place a small amount of the fluid on the skin surface prior to placing the fiber optic probe, although it is easier to place it on the fiber-optic probe.
  • non-fluid media having the requisite optical characteristic of being near-IR neutral are also suitable as optical coupling media, for example, a GORE-TEX membrane interposed between the probe and the surface of the measurement site, particularly when used in conjunction with one of the fluid media previously described.
  • bias correction is preferably made to the measurement to account for variations in the size of the meniscus caused by the guide installation.
  • a non-invasive measurement system 301 provides a "tissue measurement" (302), me Si 1xN where N corresponds to the dimensionality of the measurement.
  • m refers to the intensity spectrum of the tissue sample represented by the intensity at N wavelengths (or wavelength ranges or selected wavelengths) selected from a wavelength range, for example 700-2500 nm.
  • a background or reference, m 0 is used to standardize or normalize the tissue measurement according to the calculation
  • m 0 is an estimate of light incident on the sample
  • m is an intensity spectrum of light detected
  • a is analogous to an absorbance spectrum containing quantitative information that is based on the known interaction of the incident light with components of the body tissue.
  • the tissue measurement, m can be used directly instead of a.
  • the standardized tissue measurement, a is preferably preprocessed 303 to attenuate noise and to reduce the interference related to surface reflectance, tissue volume distortion and instrumental effects to produce the processed tissue measurement, x.
  • the preprocessing steps include calculating the first derivative, selecting specific wavelengths and wavelength regions specific to the analyte of interest and scatter correction (e.g., multiplicative scatter correction).
  • a bias correction step 304 follows the preprocessing steps defined above through the determination of the difference between the preprocessed estimated tissue background - the tissue template 305, and x through
  • x is the preprocessed tissue measurement or the selected set of features
  • ⁇ t is the estimated background or tissue template associated with the current guide placement
  • c and d are slope and intercept adjustments to the tissue template.
  • the tissue template 305 is determined through one or more tissue measurements (after preprocessing) and a data selection criterion (for example, by selecting only tissue measurements that resemble each other closely and averaging them).
  • the reference analyte values are determined from an electrochemical analysis of blood draws.
  • the analyte values are combined, according to the same strategy as that used to create the tissue template to form an analyte measurement bias adjustment 309, b, through the equation
  • g: $ ⁇ M ⁇ 3 ⁇ 1 is a calibration model 307 used to map z to an estimate of the target analyte 308.
  • the model is determined from a calibration set of exemplary paired data points each consisting of a pre-processed and bias corrected tissue measurement (z) and an associated reference analyte value (y) determined from an analysis of a blood or interstitial fluid sample.
  • z pre-processed and bias corrected tissue measurement
  • y reference analyte value
  • Calibration data must also be bias corrected if data contains subsets associated with different guide placement events.
  • the bias corrected tissue measurements undergo an outlier detection step 306.
  • outlier detection provides a method of detecting invalid measurements through spectral variations that result from problems in the instrument, poor sampling of the subject or a subject outside the calibration set.
  • One method of detecting outliers is through a principal component analysis and an analysis of the residuals.
  • the instrument collected intensity spectra in diffuse reflectance from the forearm in the wavelength range 1050-2450 nm.
  • the spectral sampling interval was 1 nm and the signal-to- noise ratio at the peak intensity was approximately 90 dB.
  • the detectors used in the study were a combination of Indium-Gallium-Arsenide (InGaAs) and extended InGaAs detectors.
  • the optical configuration consisted of a simple fiber-optic interface to the skin with a small ( ⁇ 2 mm) distance between the illumination and detection fibers.
  • Example 3 As a test of the benefit of the method of occlusion, 60 measurements were performed on a single subject using the apparatus described in Example 2. In the first set of measurements, 60 samples were collected using the guide positioning system without occlusion and absorbance was calculated as previously described. In the second set of measurements, 60 samples were collected with the use of both the guide positioning system and the preferred method of occlusion (a plug in the guide aperture).
  • Figure 6 shows the absorbance spectra collected without occlusion ( Figure 6A) and the absorbance spectra collected after occlusion ( Figure 6B). The decrease in surface variation associated with the water bands demonstrated the improved optical sampling realized as a result of the method of occlusion.
  • the invented optical probe placement guide allows highly repeatable probe placement at a targeted tissue measurement site
  • the invention may also be used to produce small sampling variations in a controlled manner by shifting the placement of the optical probe in known increments across successive optical samples.
  • the invention provides a means of limiting sampling errors during in vivo spectroscopic examination of tissue samples by providing highly repeatable optical probe placement at a targeted tissue measurement site.
  • Structural features of the invention minimize temperature fluctuations and variable stratum corneum hydration at the tissue measurement site and on the optical probe, and variations in tissue distortion and displacement, all sources of sampling error.
  • An optional temperature probe in direct contact with the skin surface at the tissue measurement site allows the monitoring of skin temperature across successive measurements.
  • An optical coupling fluid eliminates air spaces at the interface of the skin surface of the tissue measurement site and the optical probe. A fully hydrated stratum corneum is attained by the use of an occlusive plug or other mechanism.
  • spectral measurements, and resulting analyte measurements are bias corrected to compensate error resulting from guide placement. While the invented optical sampling interface system has been herein described in relation to optical sampling of tissue, one skilled in the art will appreciate that the invention may be applied in other settings requiring repeatable placement of an optical probe.
  • each of the elements of the optical probe placement guide measurement system herein described are individually beneficial to the measurement and therefore can be used with or without the other elements.
  • the guide, the hydration control system, the coupling fluid, and the bias correction are uniquely beneficial.
  • the hydration control process, bias correction, and the coupling fluid are still beneficial.

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Abstract

Selon l'invention, un système d'interface d'échantillonnage optique minimise et compense des erreurs résultant des variations d'échantillonnage et des fluctuations d'état du site de mesure. Des composants comprennent un guide de positionnement d'une sonde optique présentant un orifice, dans lequel ladite sonde optique est reçue, qui facilite la précision du positionnement répété à la surface d'un site de mesure de tissus avec une perturbation minimale, répétée sur les tissus de surface. Ledit orifice crée un ménisque tissulaire qui réduit l'interférence provoquée par les irrégularités de surface et contrôle les variations dans le volume tissulaire échantillonné. Lesdits composants comprennent de plus un élément occlusif placé sur le ménisque tissulaire qui isole le ménisque des fluctuations environnementales, par stabilisation de l'hydratation du site et ainsi de la tension de surface. Les composants comprennent également un support de couplage optique qui élimine les bulles d'air entre la surface de la peau et la sonde optique, un élément de correction de justesse qui applique une correction de justesse à des mesures spectrales, et des mesures d'analytes associées. Lorsque le guide est remplacé, une nouvelle correction de justesse est déterminée pour des mesures effectuées avec le nouveau guide de positionnement. Des composants séparés du système peuvent être utilisés individuellement.
PCT/US2003/018665 2002-06-12 2003-06-11 Systeme d'interface d'echantillonnage optique pour une mesure <i>in vivo</i> de tissus Ceased WO2003105664A2 (fr)

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US7233816B2 (en) 2007-06-19
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US20070060805A9 (en) 2007-03-15
AU2003243547A1 (en) 2003-12-31
US20050267341A1 (en) 2005-12-01
AU2003243547A8 (en) 2003-12-31
EP1511415A4 (fr) 2008-12-31
JP2005530137A (ja) 2005-10-06
US20030069484A1 (en) 2003-04-10
WO2003105664A3 (fr) 2004-02-19
US7206623B2 (en) 2007-04-17

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